Stepwise Coastdown Methodology for Measuring Tire Rolling Resistance

Standard:
Revised:
  • 2017-07-26
 
  • CURRENT
Publisher:
  • SAE International
Pages:
39
Scope:

This SAE Recommended Practice is applicable to pneumatic Passenger Car “P” Type, Light Truck Metric, and Light Truck High Flotation tires, or similar tires approved by bodies other than Tire & Rim Association. The methodology is applicable within normal operating ranges of vertical load and inflation pressure, and for velocities between 115 km/h and 15 km/h (71 mph and 9 mph) during a relatively short duration event such as a coastdown. This procedure is applicable only to operation in the free-rolling mode at zero slip and camber angle for ambient temperatures between 20 °C and 28 °C (68 °F and 82 °F) and for surfaces with diameters of 1.2 m (48 in) diameter or greater. Details regarding the equipment, tires, and test methods used specifically for validation of this document are included in Appendix A.

Rationale:

The revisions in this version are to address missing SI units a typo in section 3.10 and to clarify issues associated with zero speed points in the MERF/SMERF calculations.

History:
Standard Published Revision Status
J2452_201707 2017-07-26 Latest Revised
1999-06-01 Historical Issued
AKA:
  • SAE J 2452
Sector:
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